SML2108F datasheet(3/21 Pages) SUMMIT

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2053 2.2 11/07/00

SML2108

SUMMIT MICROELECTRONICS, Inc.

PRELIMINARY

PIN CONFIGURATION

PIN DESCRIPTIONS

DETECT (12)

This is the analog input from the laser monitor photodiode

for the integrator circuit. There is an on-board resistance

of 2M

Ω between the DETECT input and CAP1 pin.

CAP1 and CAP2 (11 & 10)

Capacitor inputs for an external capacitor in the feedback

loop of the Mean Power Control Integrator. There is an on-

board capacitance of 500pF.

AUTOMON (6)

Active high input used to enable the internal auto-monitor

function, which provides automatic adjustments to the

modulation output currents (MODP and MODN) based on

the internal A/D output and the values stored in the

nonvolatile lookup table. This pin has an internal 100k

Ω

pullup.

ALERT# (8)

Active low, open-drain output. This pin is driven low

whenever the bias current increases beyond a predefined

nonvolatile threshold. This can be used to predict laser

failure.

SDA, SCL (4 & 5)

Data and Clock lines, respectively, whose function and

use are based on the industry standard I2C interface.

Lookup table values, configuration data, and D/A and A/D

registers may all be accessed via these two pins of the

SML2108. These pins have internal 100k

Ω pullups.

A0, A1, A2 (1, 2, & 3)

Address Pins for the interface provided to allow multiple

devices on a single bus. These pins have internal 100k

Ω

pullups.

RDY# (7)

Active low, open-drain output. This pin is driven low

whenever the internal A/D is performing a conversion, or

while the on-board EEPROM is being programmed.

EXT TEMP (9)

Temperature input (or no connection). This pin can be

programmed as an input to the ADC and can interface a

temperature sensor. The EXT TEMP pin is multiplexed

with the bias current to provide a means of configuring the

input to the ADC. When EXT TEMP is programmed as the

SDA

SCL

AUTOMON

RDY#

ALERT#

EXT TEMP

CAP2

CAP1

DETECT

MODN

BIASN

VSS

BIASN

MODN

48-Pin TQFP

2053 PCon 2.0

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